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Christie's scientific specialist James Hyslop poses for photographs with a sub-fossilized pre-17th century Elephant Bird egg at the auction house's premises in London, Wednesday, March 27, 2013. The egg, which is estimated to fetch 20,000 to 30,000 pounds ($30,210 to $45,315 and 23,645 to 35,467 euro) in the forthcoming Travel, Science and Natural History sale on April 24, measures over 100 times the average size of a chicken egg, and stands at 21cm in diameter and 30cm in height. The extinct Elephant Bird species was native to Madagascar and among the heaviest known birds. (AP Photo/Matt Dunham)